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Monthly Weather Bulletin

MAY 2015 

INTRODUCTION

Malaysia has entered a phase of the Southwest Monsoon season in mid- May. Southwest monsoon is characterized by surface winds blowing steadily from the southwest, where the weather is relatively dry compared to other seasons. During this period, atmospheric conditions are relatively stable. This situation will lead to most parts of the country will experience the less rainy days.

RAINFALL

The East Coast of Peninsula, western Kelantan, Terengganu and most of the interior Pahang has received rainfall below average, with total cumulative rainfall of less than 200 mm. The same situation was found to occur in the western state of Selangor and Kedah with anomalous percentage reduction of 20% to over 60 % of the average. At the same time, there are areas that have received a lot of rain. Rural Kelantan, Perak and Melaka has recorded rainfall above the average level with an increase in the percentage of anomalies by 20% to over 60 %. For other regions the average rainfall was recorded.

 In Sarawak, Miri, Kapit and some interior has received below average rainfall, with total cumulative rainfall of less than 200 mm. Meanwhile, Kuching recorded above average rainfall with anomalous increase of 20% to 40 % of the average. Other areas recorded the average rainfall.

 For Sabah, generally most areas received below average rainfall, with total cumulative rainfall of 200 mm. However, in parts of southern Sabah, Tawau and southern Sabah has received an average rainfall.

 A record number of rainy days in main stations of Peninsular Malaysia shows, Gong Kedak Meteorological Station recorded the fewest number of rainy days of 4 days while Cameron Highlands Meteorological Station recorded the highest of rainy days of 26 days. Range of the number of rainy days in Sarawak is 13 days recorded in Bintulu Meteorological Station and 22 days in Kuching Meteorological Station. For Sabah, the range of the number of rainy days is between 4 days recorded in Sandakan Meteorological Station and 21 days in Ranau Meteorological Station.

 

TEMPERATURE

Most areas in Malaysia recorded an average temperature higher than the long-term average in May. In Peninsular Malaysia, the largest positive deviation is +1.1 recorded at Subang, Kuala Pilah and Mersing Meteorological Station while the lowest was -0.2 deviation was recorded at Sepang KLIA Meteorological Station. For the state of Sarawak, the largest positive deviation is +0.6 was recorded in Limbang Meteorological Station while the smallest deviation, 0.2 were recorded in Kapit and Bintulu Meteorological Station. For the Sabah state, the largest positive deviation is +1.4 was recorded in Kota Kinabalu Meteorological Station while the smallest deviation, 0.2 recorded in Labuan, Keningau, Kudat and Tawau Meteorological Station.

 In the highlands, Cameron Highlands Meteorological Station recorded a temperature range between 15.5 ° C and 24.6 ° C with a mean temperature of 19.0 °C.

 

SOLAR RADIATION

Most major meteorological stations recorded the amount of solar radiation higher than the average. The average daily solar radiation range for lowland areas are from 15.59 MJm -² are recorded in Kuching Meteorological Station and 23.68 MJm-2 recorded at Kota Bharu Meteorological Station. In the highlands, Cameron Highlands Meteorological Station recorded the average solar radiation is 13.47 MJm-2. The largest positive deviation from normal is +4.28 MJm-2 recorded in Kota Bharu Meteorological Station while the largest negative deviation is -1.18 MJm-2 were recorded in Bayan Lepas Meteorological Station.

EVAPORATION

The average of daily evaporation rate lowland areas is range from 3.2 mm/day in Temerloh, Kluang and Senai Meteorological Station and 6.2 mm/day recorded at Sandakan Meteorological Station. The largest positive deviation from the average is 1.4 mm/day were recorded in Chuping Meteorological Station, while the largest negative deviation was recorded in Ipoh Meteorological Station of -0.7 mm/day . Meanwhile, the daily evaporation rate recorded in Cameron Highlands Meteorological Station is 1.6 mm/day with deviation from an average of -0.4 mm/day.

 

 

Figures :

FIGURE 1   : Rainfall Map for Malaysia

FIGURE 2a : Mean Monthly Temperature

FIGURE 2b : Mean Monthly Maximum Temperature

FIGURE 2c : Mean Monthly Minimum Temperature


 

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